More than a month since a section of Ottawa’s LRT system shut down for six days after a freezing rainstorm, officials have revealed the cause of the outage.
But how the ice got there, officials said, was due to a “unique combination of factors.”
It is not clear why, after four years of operating the system, some of the ice mitigation strategies have not been put in place.The city’s transit commission heard details for the first time on Thursday about what exactly led to the shutdown in early January. “This unique combination of factors caused greater ice building in that area than elsewhere on the system,” Holder said. “We’re very certain that this occurred because of the accumulated ice on the OCS contact wire.”When recovery trains were dispatched later, they were forced to go slowly, which resulted in a lot of electrical arcing on a small section of the contact wire.
“That breaking of the ice, and when I say by hand, it is literally somebody in a high-rail vehicle on a bucket breaking the ice off by hand,” he said. “Those are a brass insert installed into the pantograph, which have a more aggressive metal edge and are able to break through and shear off the ice accumulation,” he said.
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